Gas-mixing valve



Bet."o 1924- 1,519,649

P. M. ANDERSON GAS MIXI NG VALVE Filed Dec. '7, 1925 attozmqx Patented Dec. 1%, i924.

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PETER IVL ANDERSON, OF SPRINGDALE, WISCONSIN.

GAS-MIXING VALVE.

Application filed December '7, 1923.

To all whom it may concern:

Be. it known that I, PETER M. ANDnRsoN, a citizen of the United States, and resident of Springdale, in. the county of Green and State of Wisconsin, have invented certain new and useful Improvements in Gas-Mixing Valves, of which the following is a specification, reference being had therein to the accompanying drawing.

It is highly desirable to secure uniformity in the results of gas combustion, whether the gas be city gas, producer gas, or other wise, but this result has been extremely difficult to reach even when constant vigilance and high skill are employed, and to attainsuch result with the same apparatus, whatever the kind of gas used, has not heretofore, so far as I am aware, been possible where a large quantity of gas is being used.

In many arts almost perfect uniformity is of great importance, and uniformity for a long period without interruption by clogging, or from any cause whatever. F or example, in large bakeries it is highly advantageous to produce, and accurately maintain a predetermined temperature no matter what the gas nor whether it is entirely clean or not.

To avoid the difliculties and obtain the results suggested is the main object of this invention.

In the accompanying drawings,

Figure 1 is an axial section of mixing valve apparatus.

Fig. 2 is a like section showing a modification of one member.

In these figures, 5 represents a block or body member having an internal cavity 6 provided'on one side with a conical opening 7, the walls 8 of which make a somewhat wide angle, leading into a mixing chamber 9 having laterally divergent walls. On the opposite side of the cavity an internally smooth straight sliding air tube 11 enters and has an inner conical end portion 12 the external face of which tapers less abruptly than the walls 8 and fits, when pushed inward, the opening 7 making contact along a single line or circle.

The air tube, which is rotary, is externally threaded at 18, has its outer end 14 inter nally flared to increase the flow of entering air, and near that end is provided with apertures 15 which are controlled, Bunsen-burner-like, by a perforated sleeve 16. Between Serial No. 679,208.

less compressed, rushes obliquely forward on all sides of the terminal margin of the air tube and enters the smaller end of the conical mixing chamber carrying with it laigely through strong suction air from the tu e.

It may be noted that the two conical members form at the same time a nozzle adapted for adjustable delivery and the only gas cut-01f, and, further, that this cut-01f is at the point where the gas has its highest velocity. Whence it follows that practically no clogging occurs at this point, the narrow discharge opening having only a lines width owing to the difierence in the tapering of the walls 8 and the exterior of the airtube. Obviously, the velocity of the gas past this contact ring is increased by the convergence of the cone walls and also by the narrowing due to the difference in taper, which gives the space between the cones a wedge-like cross section. With the cones of equal angle, slightly withdrawing the air tube would give a long annular passage of infinitesimal width in which clogging matter would soon accumulate, especially since the richer the gas the narrower such passage should be although rich gas more readily deposits carbon, and a burner having such an infinitesimal passage is absolutely useless, practically.

It is common knowledge that in certain quickly wiped out with a brush or the. like, and the cones may be readily refinished should that ever be desired.

- It may happen that the quantity of very rich gas admitted should be extremely small and that nevertheless its velocity should be high and with no increase in tendency to clogging. In such cases, the air tube 11 is replaced by another, 11, F g, 2, having at its tapered inner end a very thin preferably integral tubular closely fitting extension provided with V-shaped notches 26 through which gas enters the chamber 9 when the air tube is retracted. Slight retraction evidently allows an extremely small amount of gas to pass, through narrow ends of the notches, at high velocity, and the amount increases rapidly as withdrawal increases.

Obviously graded perforations in the sleeve, or analogous constructions, may replace the notches.

It may also be remarked that the passage formed by the wall 8 and those. of the chamber 9 may be curved if desired.

WVhat I claim is 1. The combination with a compressed fuel gas conduit having a converging discharge passage leading into a mixing expansion chamber, of an airpipe with an open endportion lying in said passage and having a segment of its outer surface more gently tapered, whereby longitudinal relative movement adjusts the discharge of fuel gas or by mere line-contact with the passage wall, cuts off the fuel, without forming a fuel crevice of material length.

2. The combination with a compressed fuel gas conduit having a converging discharge passage leading. into a mixing expansion chamber, of an air pipe with a ter minally notched open end portion, lying in said passage and having a segment of its outer surface moregently tapered, whereby longitudinal relative movement adjusts the discharge of fuel gas or by mere line-contact with the passage wall, cuts off the fuel, without forming a fuel crevice of material length.

3. In a fluid mixing valve, the combination with a valve member having a forwardly tapered passage in communication with a source of one of the fluids to be mixed, of a second, tubular valve member having an end portion externally tapered at a smaller angle than said passage, lying axially within it, adapted to form therewith an annular channel of gradually diminishing area, in moving toward the point of the cone, and arranged to close the channel through relative axial movement of the two members.

4. The combination with a gas conduit having an internally conical gas discharge opening, of an air tube having a conical end more gradually tapered than said opening and adapted to fit terminally against the inner wall of said opening.

5. The comblnation with a gas conduit having a conical discharge opening, of an air tube having a more gradually tapered end and adapted to make closing contact with the interior of said opening merely along a line. 1 V V 6. A mixing valve having a tubular delivery member with a segment of its outer surface forwardly tapered and surrounded by a narrow convergent passage between it and a tubular enclosing member, and manual I means for moving the two members rela-,

tively to vary the cross-sectional area of said convergent passage to and from zero. In testimony whereof I hereunto affix my signature.

P. M. ANDERSON. 

